I agree. I've done quite a bit of research (in my opinion, someone tell me if I missed something obvious) and there's absolutely nothing cubing related for Palm OS. If I ever decide to try to make something, even if it turns out being only semi-functional, I'll make sure to post it here. I'll probably be able to boast having made the only cubing application for the Palm... which is kinda sad when you think about it.
EDIT: by "absolutely nothing", I mean no .prc files. I have the IBM java VM, but it dosen't work quite as well as I would like. Having a prc would probably be much more efficient anyway, since it would have more direct access to ressources.
EDIT2:
Does anyone have a java midlet for PTimer? That might be nice on the IBM java VM on the Palm...